Lenovo — Problem regarding touchscreen in mobile phone

Address:	700064
Website:	www.consumercomplaints.in/new_complaint

I have bought a lenovo a6000 plus mobile phone (imei /serial no. [protected]) through flipkart on 18.10.15 (invoice date). now for the last few days there is a gross malfunction involving the typing, opening menu and its other functions. i brought the phone at the nearest servicing centre at salt lake, kolkata yesterday on 23.9.16. the service provider there refused to render a free service despite being within the warranty period on the pretext that the one corner of the phone was not as smooth as the other three corners, so she took it as the touchscreen problem which according to her, is not covered under warranty. but the touchscreen of my mobile is totally unblemished, only one corner of the metal/plastic body is a little ragged.
The claim of the service provider regarding the touchscreen damage is completely ridiculous. lenovo had a good reputation to me so far and i never believed that i will end up with such a poor quality service.
Kindly look into the matter urgently.
Krishnendu dutta chowdhury
Bf-130, salt lake city, kolkata -700064
Ph no. [protected]